block: destroy bdi before blockdev is unregistered.

Because of the peculiar way that md devices are created (automatically
when the device node is opened), a new device can be created and
registered immediately after the
	blk_unregister_region(disk_devt(disk), disk->minors);
call in del_gendisk().

Therefore it is important that all visible artifacts of the previous
device are removed before this call.  In particular, the 'bdi'.

Since:
commit c4db59d31e39ea067c32163ac961e9c80198fd37
Author: Christoph Hellwig <hch@lst.de>
    fs: don't reassign dirty inodes to default_backing_dev_info

moved the
   device_unregister(bdi->dev);
call from bdi_unregister() to bdi_destroy() it has been quite easy to
lose a race and have a new (e.g.) "md127" be created after the
blk_unregister_region() call and before bdi_destroy() is ultimately
called by the final 'put_disk', which must come after del_gendisk().

The new device finds that the bdi name is already registered in sysfs
and complains

> [ 9627.630029] WARNING: CPU: 18 PID: 3330 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x5a/0x70()
> [ 9627.630032] sysfs: cannot create duplicate filename '/devices/virtual/bdi/9:127'

We can fix this by moving the bdi_destroy() call out of
blk_release_queue() (which can happen very late when a refcount
reaches zero) and into blk_cleanup_queue() - which happens exactly when the md
device driver calls it.

Then it is only necessary for md to call blk_cleanup_queue() before
del_gendisk().  As loop.c devices are also created on demand by
opening the device node, we make the same change there.

Fixes: c4db59d31e39ea067c32163ac961e9c80198fd37
Reported-by: Azat Khuzhin <a3at.mail@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org (v4.0)
Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

4 files changed, 5 insertions, 5 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index fd154b94447a..7871603f0a29 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -552,6 +552,8 @@ void blk_cleanup_queue(struct request_queue *q)
                 q->queue_lock = &q->__queue_lock;
         spin_unlock_irq(lock);
 
+        bdi_destroy(&q->backing_dev_info);
+
         /* @q is and will stay empty, shutdown and put */
         blk_put_queue(q);
 }
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index faaf36ade7eb..2b8fd302f677 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -522,8 +522,6 @@ static void blk_release_queue(struct kobject *kobj)
 
         blk_trace_shutdown(q);
 
-        bdi_destroy(&q->backing_dev_info);
-
         ida_simple_remove(&blk_queue_ida, q->id);
         call_rcu(&q->rcu_head, blk_free_queue_rcu);
 }
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index ae3fcb4199e9..d7173cb1ea76 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1620,8 +1620,8 @@ out:
 
 static void loop_remove(struct loop_device *lo)
 {
-        del_gendisk(lo->lo_disk);
         blk_cleanup_queue(lo->lo_queue);
+        del_gendisk(lo->lo_disk);
         blk_mq_free_tag_set(&lo->tag_set);
         put_disk(lo->lo_disk);
         kfree(lo);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index e6178787ce3d..e47d1dd046da 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4754,12 +4754,12 @@ static void md_free(struct kobject *ko)
         if (mddev->sysfs_state)
                 sysfs_put(mddev->sysfs_state);
 
+        if (mddev->queue)
+                blk_cleanup_queue(mddev->queue);
         if (mddev->gendisk) {
                 del_gendisk(mddev->gendisk);
                 put_disk(mddev->gendisk);
         }
-        if (mddev->queue)
-                blk_cleanup_queue(mddev->queue);
 
         kfree(mddev);
 }